He then treated the evolute of a plane curve.
然后他讨论了平面曲线的渐屈线。
Rudders used in China's vessels did evolute from oars according to the undoubted excavated cultural relics and the relics handed down from ancient times.
据确凿无疑的出土的及传世的文物，中国船舶的舵是由桨演变而来的。
Rudders used in China's vessels did evolute from oars according to the undoubted excavated cultural relics and the relics handed down from ancient times.
据确凿无疑的出土的及传世的文物，中国船舶的舵是由桨演变而来的。
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